Fuse



NOV. 2, 1948. C, FAWCETT AL 2,452,558

FUSE

Filed Dec. 15, 1939 Patented Nov. 2, 1948 FUSE- Cecil C. Fawcett,Philadelphia, and John J. Hart, Bryn Mawr, Pa., assignors to the UnitedStates of America as represented by the Secretary of War ApplicationDecember 15, 1939', Serial No. 309,417

(Granted under the act of March 3, 1883, as amended April 30, 1928; 370O. G. 757) 2 Claims.

The invention described herein may be manufactured and used by or forthe Government for governmental purposes without the payment to us ofany royalty thereon.

This invention relates to a fuse.

The purpose of the invention is to provide a structure in which a baseplug for a mechanical time fuse may conveniently carry a compressedpellet of black powder or other relay charge in its front face and inwhich ame communication to a central ash passage is provided by means ofa disk interposed between the base plug and the fuse body.

The specific nature of the invention as well as other objects andadvantages thereof will clearly appear from a description of a preferredembodiment as shown in the accompanying drawings in which:

Fig. 1 is a longitudinal sectional view through a portion of a fuse;

Fig. 2 is a sectional view on the line 2-2 of Fig. 1.

Referring to the drawings by characters of reference there is shown aportion of a mechanical time fuse comprising a body 5 carrying aclockwork mechanism indicated generally by its frame 6 and including afiring pin 'I and a primer 8. A ash passage 9 leads from the primer to acavity ID in the rear end of the body.

A base plug II tting in the cavity I and secured to the body by thethreaded engagement I2 is formed with an annular groove I3 in themarginal portion of its front face. Black powder compressed in thegroove forms a ring pellet I4 which is radially spaced from the aXis ofthe fuse by the same amount as the primer 8 and flash passage 9.

A shallow recess I5 formed centrally in the front face of thebase plugand spaced from the groove I3 is in communication with a reduced passageIB and includes an annular shoulder I1.

The passage I6 is preferably tapered and may be closed at the rear faceof the base plug by a thin disc I8 which is readily perforated by thename from the pellet I4. In the fuse for which the present improvementis made the passage I6 has an extremely wide mouth to extend beyond theflash passage 9 and it receives a bag of loose powder.

Y 2 2I conveniently formed by marginal indents which are of suicientradial dimension to extend inwardly from the inner edge of the shoulderI'I.

In operation the flame from the primer 8 ignites the black powder pelletI4 and the ame from the pellet is free to pass to the openings ZI byvirtue of the spacing between the marginal front face of the plug andthe face 20 of the fuse body. The flame after passing through theopenings 2I is directed through the passage I6 to a booster charge notshown.

We claim:

1. In a fuse, a body having a cavity, a base plug in the cavity of thebody, said plug having a recess in its front facev and a communicatingash passage reduced to provide a shoulder, a disk tting in the recessand seated on the shoulder of the plug, said disk having a thickness inexcess of the depth of the recess to space the marginal face of the plugfrom the fuse body, said disk formed with marginal openings establishingcommunication between the recess and passage in the plug, and an annularpowder pellet carried in the marginal face of the plug.

2. In a fuse, a body having a cavity, a base plug in the cavity of thebody and having a central passage, an annular powder pellet carried inthe marginal face of the plug and radially spaced from the centralpassage, a disk interposed between the plug and body above the centralpassage of the plug and spacing the marginal face of the plug from thebody, and openings in the disk establishing name communication betweenthe central passage and the powder pellet in the marginal face of theplug.

CECIL C. FAWCEIT. JOHN J. I-IART.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 1,208,105 Dalton Dec. 12, 19161,230,933 Simpson June 26, 1917 1,299,308 Doe Apr. 1, 1919 1,481,677Blashill Jan. 22, 1924 FOREIGN PATENTS Number Country Date 16,517 GreatBritain July 21, 1906

